CN202497852U - Mixing device for ultrafine particles - Google Patents

Abstract

The utility model discloses a mixing device for ultrafine particles. The mixing device system for ultrafine particles consists of a hopper, a screw feeder, a Roots blower, an air chamber, a circulating fluidized bed, a cyclone dust collector, a standpipe, It is composed of a feeder, a bag filter and a material collector; the circulating fluidized bed is composed of a low-speed bed, a transition section, and a high-speed bed; the upper part of the air chamber has a dense hole plate as the air distribution plate; the bag filter is connected to the cyclone dust collector. There are ultra-fine particles and auxiliary fluidized particles in the low-velocity bed. Auxiliary fluidized particles are fed into the low-velocity bed through the auxiliary fluidized particle silo. There are two or more types of ultrafine particles. The particle size of ultrafine particles is less than 100 μm. Roots blowers provide an inert fluidizing gas that does not react with ultrafine particles. The particle size of the auxiliary fluidized particles is larger than 100 μm and smaller than 100 mm. The feeding device is a screw feeder.

Description

A mixing device for ultrafine particles

technical field

The utility model relates to a mixing device for ultrafine particles, in particular to a mixing device for different types of ultrafine particles.

Background technique

Ultrafine particles have large specific surface area, good chemical reactivity and solid-solid surface reaction characteristics, and are widely used as reactants in synthesis reactions. The current process for producing ultrafine particle mixtures generally has low efficiency, low productivity levels, discontinuous production and uneven mixing, so the output and quality of ultrafine particle mixtures are greatly limited.

As a raw material for chemical production, the mixture of ultra-fine particles will lead to a decline in product quality and qualified rate due to uneven mixing during the preparation process. Therefore, looking for a superfine particle mixing device with high mixing uniformity and continuous production can bring huge benefits to production. Fluidized bed has unique advantages in the fields of particle mixing and reaction. However, for ultrafine particles with a particle size of less than 100 μm, the adhesion between particles is very strong, and ultrafine particles are usually not easy to fluidize. Difficult to mix evenly, the traditional fluidization technology is easy to form channel flow, it is difficult to achieve stable fluidization, and the mixing is uneven. Only by means of auxiliary particle fluidization with larger particle size to strengthen the mixing of ultrafine particles, or divide the ultrafine particles into multiple streams to flow through the gaps between the fixed beds formed by larger auxiliary particles, so as to achieve ultrafine particles evenly mixed.

Contents of the invention

Purpose of the invention: In view of the current situation of backward mixing process of ultrafine particles, low production efficiency, discontinuous production and uneven mixing, the purpose of this utility model is to provide a high degree of automation, high mixing efficiency, high mixing uniformity and large output. , energy-saving, ultra-fine particle mixing complete set of technical devices with continuous production capacity.

Technical scheme: in order to realize the above-mentioned purpose of the invention, the technical scheme that the utility model adopts is:

The mixing device for ultrafine particles of the utility model includes a hopper, a screw feeder, a Roots blower, an air chamber, a circulating fluidized bed, a first-stage cyclone dust collector, a standpipe, a feeder, a second-stage cyclone separator, and a cloth bag. Dust collector and material collector; Among them, the circulating fluidized bed is composed of a low-speed bed, a transition section, and a high-speed bed, and a dense-hole plate is arranged at the lower part of the low-speed bed as an air distribution plate, and the lower part of the air distribution plate is an air chamber. The upper part of the low-speed bed is connected with a transition section, the upper part of the transition section is connected with a high-speed bed, the upper part of the high-speed bed is connected with the first-stage cyclone dust collector, the lower part of the first-stage cyclone dust collector is connected with the standpipe, and the lower part of the standpipe passes through the feeder It communicates with the lower half of the low-speed bed; the upper part of the first-stage cyclone dust collector communicates with the second-stage cyclone separator, the bag filter is located in the second-stage cyclone separator, and the lower part of the second-stage cyclone separator communicates with the material collector; at low speed There are superfine particles and auxiliary fluidized particles in the bed, and the auxiliary fluidized particles are fed into the low-velocity bed through the auxiliary fluidized particle hopper.

There are two or more types of ultrafine particles.

The particle size of ultrafine particles is less than 100 μm.

Roots blowers provide an inert fluidizing gas that does not chemically react with ultrafine particles.

The particle size of auxiliary fluidized particles is between 100 μm and 100 mm.

Beneficial effect: the utility model has the following advantages:

The utility model realizes stable fluidization, continuous mixing and production of superfine particles in a fluidized bed by means of auxiliary fluidized particles with larger particle diameters. There are two technical routes: (1) After a certain amount of fluidizing gas is supplied to the circulating fluidized bed, the auxiliary fluidized particles with large particle size can be uniformly fluidized in the low-velocity bed, but will not be entrained out of the high-speed bed. Driven to achieve stable fluidization of ultra-fine particles in the fluidized bed; (2) After a certain fluidization gas is supplied to the circulating fluidized bed, the auxiliary fluidized particles with large particle sizes may not be fluidized, but form a certain height of static Fixed bed, the superfine particles fed into the low-velocity bed at the lower part of the circulating fluidized bed by the screw feeder can only pass through the gaps of the auxiliary fluidized particles under the action of the fluidizing gas, because the gaps are multi-channel and multi- Direction, there is a certain residence time in the process of passing through the bed height of the auxiliary fluidized particles, so that the ultrafine particles can achieve uniform mixing of two or more ultrafine particles during the passage. The above two kinds of mixing processes all use auxiliary fluidized particles to achieve good mixing of ultrafine particles in the low-velocity bed of the circulating fluidized bed. At the same time, the fluidization gas will carry the ultrafine particles up to the high-speed bed of the circulating fluidized bed, realize the remixing of the ultrafine particles in the fast flow, and quickly carry the mixed ultrafine particles out of the bed. The primary cyclone separator separates most of the ultrafine particles and returns them to the low-velocity bed through the standpipe and return feeder. The rest of the uniformly mixed ultrafine particle products enter the secondary cyclone separator through the outlet of the primary cyclone separator, and then enter the finished material collector through the bag filter, which becomes a qualified ultrafine particle mixture product, waiting to be transported out of the factory. The utility model greatly prolongs the mixing time of ultrafine particles, realizes uniform mixing and continuous production of ultrafine particles, and is convenient for large-scale production.

In summary, a mixing device for ultrafine particles in the utility model makes fluidized mixing of ultrafine particles possible, has strong continuous production capacity, is easy to realize automatic continuous production, and mixes ultrafine particles evenly High density, good mixing uniformity, high degree of automation, high efficiency and energy saving, etc., can be used for large-scale production.

Description of drawings

Fig. 1 is a schematic diagram of an ultrafine particle mixing device of the present invention.

Detailed ways

Example 1

The mixing device for ultrafine particles of the utility model includes a hopper 1, a screw feeder 2, a Roots blower 3, an air chamber 4, a circulating fluidized bed 5, a primary cyclone dust collector 6, a standpipe 7, and a feeder 8 , secondary cyclone separator 9, bag filter 10 and material collector 11; wherein, circulating fluidized bed 5 is made up of low-velocity bed 12, transition section 13, and high-speed bed 14, and the bottom of low-velocity bed 12 is provided with dense hole The plate is used as the air distribution plate 17, and the lower part of the air distribution plate 17 is the air chamber 4. The upper part of the low-speed bed 12 is connected with a transition section 13, and the upper part of the transition section 13 is connected with a high-speed bed 14. The upper part of the high-speed bed 14 is connected to the first-stage The cyclone dust collector 6 is connected, the lower part of the first-stage cyclone dust collector 6 is connected to the standpipe 7, and the lower part of the standpipe 7 is connected to the lower half of the low-speed bed 12 through the feeder 8; the upper part of the first-stage cyclone dust collector 6 is connected to the second The cyclone separator 9 is connected, and the bag filter 10 is located in the secondary cyclone separator 9, and the lower part of the secondary cyclone separator 9 is connected with the material collector 11; there are ultrafine particles 15 and auxiliary fluidized particles 16 in the low-velocity bed 12 , the auxiliary fluidized particles 16 are fed into the low-velocity bed 12 through the auxiliary fluidized particle silo 18 .

Auxiliary fluidized particles 16 are introduced into low velocity bed 12 through auxiliary fluidized particle silo 18 . The types of ultrafine particles are greater than or equal to two. The particle size of the ultrafine particles 15 is less than 100 μm. Roots blower 3 provides inert fluidizing gas that does not react with ultrafine particles 15 . The particle diameter of the auxiliary fluidization particle 16 of auxiliary fluidization is 100 μm to 100 mm. The feeding device is a screw feeder 2. The homogeneously mixed ultrafine particle mixture finished product is collected in the material collector 11 by the cyclone dust collector 9 and the bag dust collector 10, and is ready to leave the factory.

Example 2

A mixing device for different ultrafine particles, as shown in Figure 1 and Example 1, first pass a certain amount of auxiliary fluidized particles 16 (such as hollow alumina) with a particle size of 100 μm-100 mm through the auxiliary fluidized particle silo 18 (with a valve on it) into the low velocity bed 12. Then, manganese dioxide and lithium carbonate, which are materials for preparing lithium manganate with a particle size of less than 100 μm, are transported into the low-speed bed 12 through the screw feeder 2 . At the same time, fluidized nitrogen is supplied to the low-velocity bed 12 at the bottom of the circulating fluidized bed 5, and the manganese dioxide and lithium carbonate entering the circulating fluidized bed 5 are carried out in the low-velocity bed 12 under the action of the auxiliary fluidized particles 16 (hollow alumina). Steady-state fluidization and mixing under gas velocity to achieve primary mixing of manganese dioxide and lithium carbonate. Carried by the fluidized gas flow, the mixture of manganese dioxide and lithium carbonate rises into the high-speed bed 14, and is carried by the high-speed gas into the primary cyclone dust collector 6, and part of the mixture of manganese oxide and lithium carbonate is captured by the primary cyclone dust collector 6 Come down and return to the low-velocity bed 12 again by standpipe 7 and feeder 8, realize the secondary mixing of manganese dioxide and lithium carbonate. Control the gas velocity of the fluidization gas to be greater than the critical fluidization velocity of the auxiliary fluidization particles 16, and at the same time be smaller than the entrained eluting velocity of the auxiliary fluidization particles 16, so that the auxiliary fluidization particles 16 can only be in a fluidized state and cannot be fluidized by the fluidization gas. Entrained out of the circulating fluidized bed 5. The material circulates many times to make the two kinds of superfine particle mixture mix well, and the mixture of manganese dioxide and lithium carbonate that meets the mixing requirements flows out of the cyclone dust collector 6, is carried by the airflow into the secondary cyclone dust collector 9, and then enters the bag filter 10 , exhausted gas out of the system, qualified particle mixture of manganese dioxide and lithium carbonate finished product is stored in the material collector 11, to be shipped.

Example 3

A mixing device for different ultrafine particles, as shown in Figure 1 and Example 1, a certain amount of auxiliary fluidized particles 16 (such as solid alumina) with a particle size of 100 μm-100 mm are passed through the auxiliary fluidized particle silo 18 (with a valve on it) into the low velocity bed 12. Keep the static bed height of auxiliary material 500-1000mm. Then, manganese dioxide and lithium carbonate, which are materials for preparing lithium manganate with a particle size of less than 100 μm, are transported into the low-speed bed 12 through the screw feeder 2 . Fluidizing nitrogen gas is supplied to the low velocity bed 12 at the bottom of the circulating fluidized bed 5, and the manganese dioxide and lithium carbonate entering the lower part of the circulating fluidized bed 5 pass through the gaps of the auxiliary fluidized particles 16 (solid alumina). The gas velocity of the fluidized gas is controlled to be greater than the terminal velocity of the ultrafine particles 15 and smaller than the critical fluidization velocity of the auxiliary fluidized particles 16, so that the auxiliary fluidized particles 16 can only be in a static state of the fixed bed and cannot be fluidized. Since the auxiliary fluidized large particles cannot be fluidized and can only be statically stacked in the low-velocity bed 12, the ultrafine particles of manganese dioxide and lithium carbonate can only pass through the gaps of the auxiliary large particles, and the process of passing through many gaps is achieved. A primary mix of manganese dioxide and lithium carbonate ultrafine particles. Carried by the fluidized gas flow, the mixture of manganese dioxide and lithium carbonate rises into the high-speed bed 14, and is carried by the high-speed gas into the primary cyclone dust collector 6, and part of the mixture of manganese oxide and lithium carbonate is captured by the primary cyclone dust collector 6 Come down and return to the low-velocity bed 12 again by standpipe 7 and feeder 8, realize the secondary mixing of manganese dioxide and lithium carbonate. The material circulates many times to make the two mixtures mix well. The mixture of manganese dioxide and lithium carbonate that meets the mixing requirements flows out of the cyclone dust collector 6, is carried by the airflow into the secondary cyclone dust collector 9, and then enters the bag filter 10. Out of the system, the qualified particle mixture manganese dioxide and lithium carbonate finished products are stored in the material collector 11 and are ready to leave the factory.

Claims (5)

1. the mixing arrangement of a superfine particulate matter is characterized in that this mixing arrangement comprises hopper (1), screw(-type) feeder (2), roots blower (3), air compartment (4), recirculating fluidized bed (5), one-level cyclone dust collectors (6), standpipe (7), material returning device (8), secondary cyclone (9), sack cleaner (10) and material collector (11); Wherein, Recirculating fluidized bed (5) by low speed bed (12), changeover portion (13), and at a high speed bed (14) form; Being provided with porous plate in the bottom of low speed bed (12) as air distribution plate (17), is air compartment (4) in the bottom of air distribution plate (17), is connected with changeover portion (13) on the top of low speed bed (12); The top of changeover portion (13) is connected with bed (14) at a high speed; The top of bed (14) is communicated with one-level cyclone dust collectors (6) at a high speed, and the bottom of one-level cyclone dust collectors (6) connects standpipe (7), and the bottom of standpipe (7) is communicated with the Lower Half of low speed bed (12) through material returning device (8); The top of one-level cyclone dust collectors (6) is communicated with secondary cyclone (9), and sack cleaner (10) is arranged in secondary cyclone (9), and the bottom of secondary cyclone (9) is communicated with material collector (11); Ultra-fine grain (15) and auxiliary fluidized particles (16) are arranged in low speed bed (12), and auxiliary fluidized particles (16) adds in low speed bed (12) through auxiliary fluidisation particulate material storehouse (18).

2. according to the mixing arrangement of a kind of superfine particulate matter described in the claim 1, the kind that it is characterized in that ultra-fine grain (15) is more than or equal to two kinds.

3. according to the mixing arrangement of a kind of superfine particulate matter described in the claim 1, the particle diameter that it is characterized in that ultra-fine grain (15) is less than 100 μ m.

4. according to the mixing arrangement of a kind of superfine particulate matter described in the claim 1, it is characterized in that roots blower (3) provides the inertia fluidized gas that chemical reaction does not take place with ultra-fine grain (15).

5. according to the mixing arrangement of a kind of superfine particulate matter described in the claim 1, it is characterized in that the particle diameter of auxiliary fluidized particles (16) is between 100 μ m ~ 100 mm.

Images